Binary image interpolation method using adaptive threshold of surrounding pixel values

摘要

The present invention relates to a coding method for reducing the cost of storage and transmission by compressing entity information in an image. In particular, in order to effectively interpolate a downsampled binary image, (10) for inputting an image reduced by 1/2 in each direction so as to obtain a binary value by setting a threshold value to be binarized using a context, and comparing the threshold value with an interpolated pixel value; A second step (20) of setting an initial position of a position to be interpolated; A third step (30) of obtaining a context using surrounding pixels (C0 to C4) other than four adjacent pixels; A fourth step (40) of obtaining an interpolation value using surrounding pixels; A fifth step (50) of obtaining a threshold value of a pixel to be interpolated corresponding to the context and comparing the interpolated value obtained as described above with a variable threshold corresponding to the context; A sixth step (60) of interpolating the original binary block to 1 if the interpolation value is larger than the variable threshold value; If the interpolation value is smaller than the variable threshold value, interpolating the original binary block to 0; An eighth step of continuing interpolation until all interpolation has been completed by checking whether interpolation has been performed on all pixels or until all interpolation is performed on all pixels 80), and a binary image interpolation method using an adaptive threshold value of surrounding pixel values.